However, for some reason, I can barely hear the guitar sound come out of the amp. It is barely audible, even if I turn the amp up (where I definetly hear a loud buzzing, so the amp is fine). Its getting the guitar tone, just really soft.

crusty i am doing this right now, but it still isnt processing the amp tube sound. at least it doesnt sound like it, you definetly can here that there is a lack of wrmth compared to when the guitar goes straight into the amp. is there some preset that i need to enable? i have the fx loop set to pre, and no other setting are on, so theoretically this should give me the same sound as if i were to go guitar>amp

Came across your post when asking a question about how to split effects between post and pre-amp stages of a valve amp myself!

I think I know why your problem might be arising, it could be down to an impedance mismatch, (see my post at http://line6.com/community/message/129125). Hopefully we'll both get some answers from the gurus out there.

PS - Sorry my post wasn't in time for your gig - hope it went well nonetheless!

best/AL

The information above may not be current, and you should direct questions to the current forum or review the manual.